Xylem MPV - Manual (Page 88)

Installation, Operating and Maintenance Instruction
Model MPB, MPV
MPB 100-english page 84 Revision 02
Article No 771074115 Issue 01/2010
All parts must have taken on the temperature of
the environment.
Secure disassembled pumps, units or single
parts against tipping over or rolling off.
While disassembling the pump use of an open
flame (blowlamp, etc.) only, when there is no
danger of setting fire, cause an explosion or
cause injurious vapours.
Never apply heat to remove the impeller nut.
Use of heat may result in severe physical injury
and property damage.
Use original spare parts only. Pay attention to
the right materials and the matching design.
8.2 General
Works, which require shocks (hammer), must
only be performed outside the explosive
atmosphere or only non-sparking tools must be
used.
The schematic sectional drawing with part
designations that matches the delivered pump and the
design of the shaft seal can be found in the enclosed
data sheet and/or the order confirmation and the
enclosures.
All work carried out on the pump must be performed in
compliance with the rules of machine construction.
Never use force (never hit too hard with a hammer
and always use a suitable base (hard wood or
copper)).
Obey safety instructions, secure components so
that they cannot fall over or roll away
Only use suitable products in a perfect technical
condition, (e.g. properties of lubricating agent
must be known)
Always clean parts before installation (dust, rust,
particles, old grease etc.).
All specified values must be complied with (e.g.
torque etc.)
Fitting surfaces and centering should only be
lubricated shortly before assembly.
8.3 Tools and Equipment
In normal cases no special tools are required.
The following tools simplify assembly work:
Warm-up device for rolling bearing (only for MPV
design)
Two-armed withdrawing screw
Sickle spanner for shaft nuts
Cleaning and degreasing agents (e.g. Acetone).
Lubricant for the rolling bearing (see the
operating instructions for selection, only for MPV
design).
Lubricating agent for assembly work (e.g. beef
dripping, Molikote, silicon grease and soap
water).
For drinking water pumps only lubricants should
be used that are guaranteed to contain no
harmful substances.
8.4 Dismantling the Pump
Work may only be carried out while the pump is at a
standstill.
The pump must be shut down in accordance with the
Operating Instructions. For pumps with automatic
pump control appropriate measures must be taken to
prevent the pump from starting up accidentally (e.g.
cutting off the power supply).
Drain the pump via the drain plug (D).
The operator's or manufacturer's fitters must be
informed about the nature of the pumping
medium. In the case of pumps that are operated
with hazardous materials, the pumping medium
must be disposed of in an environmentally
friendly manner before the pump is dismantled.
Please note that residues of pumping medium
are present even in pumps that have been
drained. If necessary the pump must be rinsed
or decontaminated.
Remove the pump from the pipe network and
foundation with the installed motor.
Transport to the workplace (see Transport,
Handling in the Operating Instructions).
8.5 Replacing Roller Bearings
This section describes how to replace roller bearings.
Clean and check condition of all parts that have been
removed. In case of doubt, components should be
replaced. Wearing parts and seals must always be
replaced.
If parts or half-open pumps are to be stored for any
length of time, they must be protected from dirt and
corrosion.
To replace the rolling bearing, the pumps of designs
MPB and MPV need not be removed from the pipe
network.
8.5.1 Replacing the Rolling Bearing – MPB Design
For the associated sectional drawing, see the
appendix.
The pump is mounted in the rolling bearings of the
motor.
Disassembly
Remove the motor by performing the following steps:
Loosen and remove the hexagon head screws
(S8) of the coupling.
Loosen and remove the nuts (M10) and washers
(S10) of the motor fastening screws (S10) and
remove the motor vertically upward (a light axial
pounding on the flange ring of the motor centering
can make removal easier).
Continue as for replacement of the motor bearing:
Loosen and remove the coupling fastening screw
(S9).